The sensitivity of the final-state wavefunction in positron impact ionisation

1985 ◽  
Vol 18 (9) ◽  
pp. 1881-1886 ◽  
Author(s):  
A S Ghosh ◽  
P S Mazumdar ◽  
M Basu
Keyword(s):  
Positron Impact ◽  
Final State ◽  
Impact Ionisation

Positron Impact Ionisation of Xe

2018 ◽  
Vol 8 (4) ◽  
pp. 21-24
Author(s):  
Sujeet Kumar ◽  
Brij Mohan Prasad Singh ◽  
S. K. Shrivastava
Keyword(s):  
Positron Impact ◽  
Impact Ionisation

scholarly journals Positron Impact Ionisation of H and He Atoms: The Continuum Model

1991 ◽  
Vol 44 (3) ◽  
pp. 265 ◽  
Author(s):  
K Ratnavelu
Keyword(s):  
Cross Sections ◽  
Continuum Model ◽  
Optical Potential ◽  
Potential Model ◽  
Experimental Measurements ◽  
Positron Impact ◽  
Optical Potential Model ◽  
Impact Ionisation ◽  
Theoretical Results ◽  
The Continuum

The continuum optical potential model is used to calculate the ionisation cross sections of H and He by positron impact. The present e+-H result is compared with the recent first measurement of e+ -H ionisation cross sections. The e+ -He calculation is also presented, together with the experimental measurements. A comparison with other theoretical results is also given.

Positron impact ionisation of He ion

2000 ◽  
Vol 11 (1) ◽  
pp. 31-36 ◽  
Author(s):  
B. Nath ◽  
S. Chattopadhyaya ◽  
C. Sinha
Keyword(s):  
Positron Impact ◽  
Impact Ionisation

scholarly journals Calculation of Electron Impact Ionisation of Atomic Hydrogen with the Exact Final-state Boundary Conditions

1994 ◽  
Vol 47 (2) ◽  
pp. 123 ◽  
Author(s):  
Dmitry A Konovalov ◽  
Ian E McCarthy
Keyword(s):  
Cross Sections ◽  
Electron Correlation ◽  
Theoretical Method ◽  
Distorted Wave ◽  
Distorted Wave Born Approximation ◽  
Final State ◽  
Exact Boundary ◽  
State Boundary ◽  
Impact Ionisation ◽  
Theory And Experiment

We present a new and very powerful theoretical method-a distorted-wave Born approximation (DWBA) with an arbitrary final-state electron-electron correlation function. This method combines the flexibility of including any theoretically desired electron-electron correlation and the physical clarity of the DWBA method. Calculations explore the use of an auxiliary final-state wave function with the exact boundary condition, in attempting to describe the absolute cross sections for ionisation of helium in coplanar symmetric kinematics and to resolve discrepancies between theory and experiment.

Screening and distortion effects in positron impact ionisation of helium

1987 ◽  
Vol 20 (7) ◽  
pp. 1635-1643 ◽  
Author(s):  
R I Campeanu ◽  
R P McEachran ◽  
A D Stauffer
Keyword(s):  
Positron Impact ◽  
Impact Ionisation

Positron impact ionisation of atoms

1998 ◽  
Vol 143 (1-2) ◽  
pp. 94-99 ◽  
Author(s):  
V. Kara ◽  
K. Paludan ◽  
J. Moxom ◽  
P. Ashley ◽  
G. Laricchia
Keyword(s):  
Positron Impact ◽  
Impact Ionisation

Positron impact ionization of He, Ne, and Ar

1996 ◽  
Vol 74 (7-8) ◽  
pp. 544-547 ◽  
Author(s):  
R. I. Campeanu ◽  
R. P. McEachran ◽  
A. D. Stauffer
Keyword(s):  
Cross Sections ◽  
Impact Ionization ◽  
High Energy ◽  
Positron Impact ◽  
Final State ◽  
Experimental Cross ◽  
Realistic Description ◽  
Ionization Model ◽  
Impact Energies ◽  
Helium Neon

An ionization model containing a realistic description of the final state of the system, but employing only plane and Coulomb waves, is applied in positron ionization of helium, neon, and argon. This model was shown to agree perfectly with the earlier helium experiment of Fromme et al. for positron impact energies between 30–150 eV. Cross sections calculated with this model for impact energies up to 500 eV compare well with recent helium, neon, and argon measurements. Our work also shows that by improving the representation of the outgoing positron and electron one achieves a better agreement with the high-energy experimental cross sections.

scholarly journals Positron-impact ionisation of hydrogen near the threshold

2007 ◽  
Vol 88 ◽  
pp. 012062 ◽  
Author(s):  
A S Kadyrov ◽  
I Bray ◽  
A T Stelbovics
Keyword(s):  
Positron Impact ◽  
Impact Ionisation
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